Pipe arrangement branching structure, method for working perforated pipe and method for working branch pipe

Abstract

A pipe arrangement branching structure is provided with a perforated pipe having two holes partitioned by a partition wall and a plurality of branch pipes connected to the respective holes of the perforated pipe in an air-tight manner. The holes of the perforated pipe at an end thereof are formed to have shapes coincident with outer shapes of the respective branch pipes by plastic deformation work. The respective branch pipes are inserted into the holes formed by the plastic deformation work and the perforated pipe and the respective branch pipes are brazed.

1 . A pipe arrangement branching structure comprising: 
 a perforated pipe having a plurality of holes partitioned by a partition wall; and    a plurality of branch pipes connected to the respective holes of the perforated pipe in a liquid-tight manner.    
   
   
       2 . The pipe arrangement branching structure according to  claim 1 , wherein 
 an outer shape of the perforated pipe is formed to have a substantially circular section.    
   
   
       3 . The pipe arrangement branching structure according to  claim 1 , wherein 
 the respective branch pipes are inserted into the respective holes of the perforated pipe and the perforated pipe and the respective branch pipes are brazed to each other.    
   
   
       4 . The pipe arrangement branching structure according to  claim 1 , wherein 
 working for plastic deformation is applied to an end of the perforated pipe and shapes of the respective holes are formed to coincide with the outer shapes of the respective branch pipes.    
   
   
       5 . The pipe arrangement branching structure according to  claim 1 , wherein 
 working for plastic deformation is applied to ends of the respective branch pipes and outer shapes of the branch pipes are formed to coincide with shapes of the respective holes of the perforated pipe.    
   
   
       6 . The pipe arrangement branching structure according to  claim 1 , wherein 
 the perforated pipe and the branch pipes are connected to each other via a joint adapter.    
   
   
       7 . The pipe arrangement branching structure according to  claim 1 , wherein 
 the perforated pipe has a bent portion in which the orientation of a longitudinal direction of the perforated pipe has been changed.    
   
   
       8 . The pipe arrangement branching structure according to  claim 1 , wherein 
 the perforated pipe has a twisted portion produced by twisting the perforated pipe about an axial center thereof.    
   
   
       9 . A method for working a perforated pipe in a pipe arrangement branching structure including a perforated pipe having a plurality of holes partitioned by a partition wall, and a plurality of branch pipes connected to the respective holes of the perforated pipe in a liquid-tight manner, the method comprising: 
 performing working for plastic deformation by using a rod jig which is inserted into each hole of the perforated pipe to regulate a shape of an inner peripheral face of each hole into a predetermined shape and a press die which is disposed on an outer peripheral face of the perforated pipe to regulate a shape of the outer peripheral face of the perforated pipe to a predetermined shape.    
   
   
       10 . A method for working a branch pipe in a pipe arrangement branching structure including a perforated pipe having a plurality of holes partitioned by a partition wall, and a plurality of branch pipes connected to the respective holes of the perforated pipe in a liquid-tight manner, the method comprising: 
 performing working for plastic deformation by using a rod jig which is inserted into each of the branch pipes to regulate a shape of an inner peripheral face of the branch pipe to a predetermined shape and a press die which is arranged on an outer peripheral face of the branch pipe to regulate a shape of the outer peripheral face of the branch pipe to a predetermined shape.    
   
   
       11 . A method for working a perforated pipe in a pipe arrangement branching structure including a perforated pipe having a plurality of holes partitioned by a partition wall, and a plurality of branch pipes connected to the respective holes of the perforated pipe in a liquid-tight manner, the method comprising: 
 applying bending work for changing the orientation of a longitudinal direction of the perforation pipe is applied to the perforation pipe.    
   
   
       12 . A method for working a perforated pipe in a pipe arrangement branching structure including a perforated pipe having a plurality of holes partitioned by a partition wall, and a plurality of branch pipes connected to the respective holes of the perforated pipe in a liquid-tight manner, the method comprising: 
 applying twisting work for twisting the perforated pipe about its axial center to the perforated pipe.    
   
   
       13 . A method for working a perforated pipe in a pipe arrangement branching structure including a perforated pipe having a plurality of holes partitioned by a partition wall, and a plurality of branch pipes connected to the respective holes of the perforated pipe in a liquid-tight manner, the method comprising: 
 applying bending work for changing the orientation of a longitudinal direction of the perforation pipe and twisting work for twisting the perforated pipe about its axial center to the perforated pipe.    
   
   
       14 . The method for working a perforated pipe according to  claim 13 , wherein 
 the bending work is first applied to the perforated pipe and the twisting work is then applied thereto.    
   
   
       15 . The method for working a perforated pipe according to  claim 13 , wherein 
 the twisting work is first applied to the perforated pipe and the bending work is then applied thereto.    
   
   
       16 . The method for working a perforated pipe according to  claim 13 , wherein 
 the bending work and the twisting work are simultaneously applied to the perforated pipe.